The 2.5 Factory Series Internal Bypass shock delivers patented race-dominating position sensitive damping technology and performance in a hassle free bolt-on kit. Patented, position sensitive internal bypass technology contains internal passages that allow fluid to bypass the piston through regulated ports as it moves through the travel. They allow for a plush predictable ride over normal offroad driving conditions and also have the ability to ramp up damping force for extreme use. These heavy-duty, steel-bodied shocks are loaded with anodized billet aluminum components and race-bred internal valving. They are designed to bolt right on with your aftermarket long-arm suspension lift kit. The 2.5 Factory Series Internal Bypass shocks utilizing all of the same components form our race winning Trophy Truck shocks with stainless steel shock shafts, PTFE-lined spherical bearings, proprietary racing oil and high-temp Vitonå¨ seals. Large 2.5 inch remote reservoirs with a large -10 hose increasing the shocks cooling capabilities.